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Now I'm sure you may remember that I've hinted at this feature before, but you can actually apply masks directly to effects. Now those masks still reside on the layer, so there is a little bit of a switch you have to do to just enable it to be applied only to the effects. So to show you what I mean, let's go down to the timeline here and with layer one selected, just open up its options. In here you'll see we have mask one, and if we open up mask one I have a mask path that already has keyframes. And if we scrub through the timeline here you'll notice that mask is moving right along with our runner here.
So what I want to do, is apply a filter to absolutely everything else, except for this runner. So, if we come look at our mask options here in the timeline, notice the blend mode for the mask is set to none. If it were set to add, it would literally mask the layer which I don't want to do. So I'll set it to none. So now all we need to do is just apply an effect. So let's go up under effect. And go to Blur and, I want to choose a Directional Blur. We want to do a blur that kind of blurs down the bleachers here and looks kind of interesting.
So, let's go ahead and just increase the blur length for the Directional Blur just by clicking and dragging. Now I want the blur to travel along with the bleachers here. So I'm going to go ahead and just click on the Direction to change the direction of the blur just to move a little bit along the bleachers. Okay, so we'll set the angle at -146. Now you notice the blur is applied to absolutely everything, and if we look up here. My effect option if I toggle it on and off yes it's being applied to absolutely everything.
But, if we actually open up the effect option here in the timeline and scroll down a little bit and open up the directional blur options. Notice there's an option down here for compositing options. So let's go ahead and click the Plus button next to the work compositing options, and sure enough, by default, it's going to choose mask one. Now, what's interesting it's chosen mask one, but the effect is still applied to the entire layer. Well, let's go back to our mask settings and set it to add.
And now you can see, it hasn't masked off the layer. It's just masked off the effect. Now I know this is applied directly to an effect because I have this blue effects option here. And a little blue dot up here next to effects in my Effect controls panel. So let's change that from add to subtract. Now it's only applied to everywhere else except for where the runners running. Now let me scroll down here, and we'll just increase the blur length a little bit, and I want to increase my mask further just so that it, the blur comes in a little bit closer to our runner.
So we'll increase the blur to 350. So, there we go. Now, if we scrub through, you can see that the effect has been applied directly to the layer but we've masked off where it's been applied to the effect itself. Now of course, you can make this more complicated by adding more masks and more effects. But the overall process is the same. Anytime you add an effect, just go to your composing options and click the Plus button to add a mask. Now this is also extraordinarily helpful in a green-screen word flow. Let's say you just want to apply spill suppression to only a certain part of the image.
Well, sure enough you could layer spill suppressor in there and then just mask off the specific area where you want the spill suppressor to be applied. Now there's one last thing before we go and that's the effect opacity. If I decrease the opacity effect, it actually allows me to blend that effect back into my layers. So if you didn't have an option to decrease how the blend works with the original footage, you can still control how that effect blends with the background footage. By adjusting the effect opacity. Let's just go ahead and change that back to 100 and deselect the layer so we can see RN result.
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